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Question
Write a balanced equation for the following conversion:
\[\ce{ZnSO4 ->[A]Zn(OH)2->[B]Na2ZnO2}\]
Solution
A: \[\ce{\underset{(white gelatinous)}{ZnSO4} + 2NaOH -> Zn(OH)2\downarrow + Na2SO4}\]
In excess Na2ZnO2 dissolves in NaOH
B: \[\ce{Zn(OH)2 + 2NaOH -> \underset{(excess)}{Na2ZnO2} + \underset{(colourless)}{\underset{Soluble}{2H2O}}}\]
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